Steam-boiler.



J. E. BELL.

Y I smM BOILER. APPLICATION FILED OCR 23 i915.

Patented Feb 13,1917

2 SHEETSSHEET I.

i INVEIVTOR.

WITNESI.S;ESV.- 5521-4 05 1 1 TTORNEYS.

J. E. BELL.

{STEAifi QZOILER. APPLICATION ma OCT. 23, I915.

Patented Feb. 13,

2 SHEETS-SHEET 2 w v E v S /A' ATTORNEYS I 1 WITNESSES:

STAWNT E- JOHN E. BELL, or BROOKLYN, new YORK, ASSiGNOB TO THE BABCOCK & w ILcox COMPANY, or BAYONNE, NEW JERSEY, A conrona'rron on NEW JERSEY.

STEAM-Borne.

Specification of Letters Patent.

Patented Feb. 13, 1917.

Application filed October 23, 1915. Serial No. 57,411.

of a chain grate stoker, and will be understood by reference to the accompanying drawings in which Figure l is a vertical longitudinal section] through a steam boiler showing my invention applied thereto; Fig. 2 a front view showing two of the boiler drums, the water boxes ,and their connections with the drums; and Figs. 3 and -l:

' enlarged side and end views of the water boxes. Similar reference numerals indicate similar parts in the several views.

1 have shown one application of my invention in connection with a steam boilerof the Stirling type having three upper steam and water drums 1. 2 and 3; a lower mud drum t; and connecting banks of generating tubes 5, 6 and 7. Any suitable battling to direct the flow of. the gases over and along the tubes may be employed. A superheater 8 may be placed in the secondary combustion chamber at the rear of the front bank of tubes.

The boiler shown is fired by a chain grate stoker 9 of any approved construction. At the rearof the stoker is a bridge wall 10 built up from the floor to the mud drum and having an extension 11 projecting up to an intermediate portion of the front bank of tubes. The upper part 11 of the bridge wall projects o er the rear of the stoker. and in the space between said art of the bridge wall and the stoker I ave arranged two water boxes 12 and 13, one above the other. These boxes extend from side to side of the furnace, as shown in Fig. 2, and have independent connections with the boiler circulation. The upper box 12 is connected to the mud drlunA by a pipe 14, entering at one end of the box, and to the front drum 1 by a pipe 15 leaving the other end of the box. Similarly the box 13 is connected to the mud drum by a pipe 16, and to the front drum 1 by a. pipe 17. The pipes in and 17 are extended in front of the upper part or extension of the box.

lower curved or clrcular box from the ra- 11 of the bridge wall and are then bent into parallelism with the tubes of the front bank 5.

The upper water box 12 is square or rectangular in section, and the lower water box is curved and preferably circular in section. The function of the former is to protectthe top of the lower box from be ing overheated by the radiant heat of the.

furnace, and also'to serve as an additional amount of cool surface to which the clinker will not become attached. \Vhere a circular water box is used alone the top must be protected from the radiant heat by brickwork. and to make this protection efiicicnt the brickwork must extend well over the top of the box, and with the box so protected the slag and clinker which accumulates on the brickwork, will extend downward and interfere with the operation By protecting the top of the diant heat by a second water box, the trouble due to the action of slag and clinker is eliminated. The cylindrical lower water box is so placed above the rear of the stoker that it will crushv the ash and clinker to a.

'substantially uniform thickness.

A cylindrical box is better than a square or rectangular box for this purpose as it serves to crush down or plane out the ash and clinker by gradually reducing its thickness as the ash and clinker travel beneath it, whereas a rectangular or square box does not produce a crushing action on the ash and clinker but serves simply as a darn or obstruction. If a rectangular or square box is set high enough to prevent trouble through the formation of a mass of unburned coal and clinker in front of it, the lower part of the fire may pass beneath the box with but little retardation. By employchain rate. Stoker, 2:

water rieetiens feet-he boxes, thereby avoiding nippleil connections between the boxes.

in my construction the inlet connections to the boxes are protected from the heat of the tire. and the outlet ronueutions are exposed to the heat of the furnac both of which "eatures' are high! desirable in an arrangement of the sort. llxposing the outlet connections to the heat of the tire iii-- creases the rapidity of the eireuhition and utlds to the eli'eetiveness of the arr-alignment.

llhat I claim and. desire to secure h liet- 33ers Potentoi' the United States i-.

l. A steam boiler furnace (501111)! ing :1 lltlgfi wall, moi two oxes plucedone above the other iii. l ft f I' tli l he ree- 0 Ah 5mm, IL loom oi Mu boxes being curved 111 section and ilil' upper square or rectangular U1 section, .szslil boxes being connected at one end to the mini (ll'llill and at the other enilto steam nml \wier drum.

A steam boiler furiinre (minimising a chain grate atoker, a bridge \rnll :mal two water bot-(es placed one above the miles at thereinof the Stoker, each in; liming =2. separate inlet connection i'rom the b iler mull drum at one owl and :1 separate oo'i let connection leading to the steam and. Water drum at the other will,

A Stenn boiler fun: ee comprising at ehaixrgrute Stoker, d bridge will um! two outer boxes placed one above the other at the of the Stoker, each box. huring e separate inlet eoiiiieetion from the iioiler mud ii-mu at one em! and :1 at

let connection lLiUllllg t the steam .illtl l eonseparate inlet (:oimertion from. the iroilelM mini drum at one ezul and, a bllillll'illl' oigtlet roiiheetion lizl llilg to the steam. and water drum at the other eml the outlet UHUHH tions being exposed in part or in whole to the heat of the immune.

5. A steziii: boiler ,iFilrhuee roozprising :1 chain grate sinker, a bridge \Ynll luu'ing n portion therrol (amending over the rear of illU SLUlfll, and two water boxes illiltttl one above the other in the spnee between the Slxilitll nml the overhang of the bridge will, the lower of Nlll boxes being rurreil ill seetion and the upper square or rectangular in sertion. sniil boxes being r imeefieal at one e111? to lhe lllliti (lrum 21ml at the other eml to :1 stem}! and water drum.

is: te.--tiu1ozi y whereof l hare hereunt Sitl'lii'il my name in the presence of two subibing \ritnessesi JUHN E. BELL. Yi' iIlQSSLS' 

